US20150070717A1 - Color reproduction assisting system, color reproduction assisting method, and non-transitory storage medium - Google Patents
Color reproduction assisting system, color reproduction assisting method, and non-transitory storage medium Download PDFInfo
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- US20150070717A1 US20150070717A1 US14/473,035 US201414473035A US2015070717A1 US 20150070717 A1 US20150070717 A1 US 20150070717A1 US 201414473035 A US201414473035 A US 201414473035A US 2015070717 A1 US2015070717 A1 US 2015070717A1
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- color
- designated color
- printing conditions
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K15/00—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers
- G06K15/02—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers using printers
- G06K15/18—Conditioning data for presenting it to the physical printing elements
- G06K15/1867—Post-processing of the composed and rasterized print image
- G06K15/1872—Image enhancement
- G06K15/1878—Adjusting colours
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/46—Colour picture communication systems
- H04N1/54—Conversion of colour picture signals to a plurality of signals some of which represent particular mixed colours, e.g. for textile printing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/46—Colour picture communication systems
- H04N1/56—Processing of colour picture signals
- H04N1/60—Colour correction or control
- H04N1/6058—Reduction of colour to a range of reproducible colours, e.g. to ink- reproducible colour gamut
Definitions
- the present invention relates to a color reproduction assisting system, a color reproduction assisting method, and a non-transitory storage medium for assisting in the reproduction of designated colors on a print.
- designated color a color designated by a color sample such as a color chip or the like.
- Various processes have been proposed to predict whether a designated color can be reproduced or not and let the operator know the predicted result.
- Japanese Laid-Open Patent Publication No. 2011-166731 discloses a process of displaying a list of the attributes and items of print mediums and the distances up to gamut boundaries. The operator can select the type of a print medium that is suitable for reproducing a designated color by confirming the details of the displayed list.
- the present invention has been made with respect to the technical concept disclosed in Japanese Laid-Open Patent Publication No. 2011-166731. It is an object of the present invention to provide a color reproduction assisting system, a color reproduction assisting method, and a non-transitory storage medium which are capable of presenting the operator with information that is especially useful for reproducing a single designated color under a plurality of printing conditions.
- a color reproduction assisting system comprising a printing condition acquirer that acquires a plurality of printing conditions, a designated color information acquirer that acquires designated color information with respect to a single designated color, a reproducibility judging section that judges whether the designated color specified from the designated color information acquired by the designated color information acquirer can be reproduced under the printing conditions acquired by printing condition acquirer or not, a substitute color determiner that determines a substitute color that is different from the designated color in order to increase number of the printing conditions under which the designated color can be reproduced on condition that at least one of the printing conditions under which the designated color cannot be reproduced is judged as being present by the reproducibility judging section, and a display device that displays visible information with respect to the substitute color determined by the substitute color determiner.
- the reproducibility judging section is provided for determining a substitute color that is different from the designated color in order to increase the number of the printing conditions under which the designated color can be reproduced, and the display device is provided for displaying visible information with respect to the substitute color. Consequently, the color reproduction assisting system is capable of presenting particularly useful information to the operator thereof in reproducing the single designated color under the printing conditions. The color reproduction assisting system is capable of presenting particularly useful information in reproducing the single designated color under the printing conditions.
- the substitute color determiner may preferably determine a color whose color difference from the designated color is minimum as the substitute color on condition that the number of the printing conditions under which the designated color can be reproduced remains the same.
- the display device may preferably display a color patch of the designated color and a color patch of the substitute color, arranged in a juxtaposed array as the visible information.
- the printing condition acquirer may further acquire degrees of importance allotted to the printing conditions, respectively, and the substitute color determiner may preferably determine the substitute color so that the designated color can be reproduced under all printing conditions whose degrees of importance are higher than other printing conditions.
- a color reproduction assisting method comprising the steps, to be carried out by at least one computer, of acquiring a plurality of printing conditions, acquiring designated color information with respect to a single designated color, judging whether the designated color specified from the designated color information can be reproduced under the printing conditions that are acquired or not, determining a substitute color that is different from the designated color in order to increase number of the printing conditions under which the designated color can be reproduced on condition that at least one of the printing conditions under which the designated color cannot be reproduced is judged as being present, and displaying visible information on a display device with respect to the substitute color that is determined.
- a non-transitory storage medium storing a program for enabling at least one computer to carry out the steps of acquiring a plurality of printing conditions, acquiring designated color information with respect to a single designated color, judging whether the designated color specified from the designated color information can be reproduced under the printing conditions that are acquired or not, determining a substitute color that is different from the designated color in order to increase number of the printing conditions under which the designated color can be reproduced on condition that at least one of the printing conditions under which the designated color cannot be reproduced is judged as being present, and displaying visible information on a display device with respect to the substitute color that is determined.
- a substitute color that is different from the designated color is determined in order to increase the number of the printing conditions under which the designated color can be reproduced, and visible information with respect to the substitute color is displayed. Consequently, particularly useful information can be presented to the operator thereof in reproducing the single designated color under the printing conditions.
- FIG. 1 is a block diagram showing an overall configuration of a print production system incorporating a color reproduction assisting system according to an embodiment of the present invention
- FIG. 2 is an electric block diagram of a working terminal shown in FIG. 1 ;
- FIG. 3 is an electric block diagram of a server shown in FIG. 1 ;
- FIG. 4 is a flowchart of an operation sequence of the working terminal shown in FIG. 2 and the server shown in FIG. 3 ;
- FIG. 5 is a view showing an image representing an input screen for entering printing conditions and designated color information
- FIG. 6 is a graph showing the relationship between gamuts and a designated color under the printing conditions
- FIG. 7A is a view showing a first image representing an evaluation result screen that shows evaluated color reproduction characteristics
- FIG. 7B is a view showing a second image representing an evaluation result screen
- FIG. 8 is a view showing a third image representing an evaluation result screen
- FIGS. 9A and 9B are diagrams illustrating a process of searching for a substitute color
- FIG. 10 is a view showing a first image representing a search result screen that shows substitute colors that have been found
- FIG. 11 is a view showing a second image representing a search result screen that shows substitute colors that have been found.
- FIG. 12 is an electric block diagram of a color reproduction assisting system according to a modification.
- FIG. 1 shows in block form an overall configuration of a print production system 10 incorporating a color reproduction assisting system 40 according to an embodiment of the present invention.
- the print production system 10 includes a router 14 serving as a device for connection to a network 12 , a server 16 which is accessible through the network 12 from terminal devices, not shown, belonging to external networks, a working terminal 18 for performing various information processing processes on contents data acquired from the server 16 , etc., a print server 20 having a printing process function, and a printing press 24 for producing a print 22 based on output data sent from the print server 20 .
- the server 16 is an apparatus that plays a central role in the workflow management in the print production system 10 .
- the server 16 is connected to the working terminal 18 and the print server 20 for communication therewith through a LAN (Local Area Network) 26 set up in the print production system 10 .
- the server 16 may be connected to various terminal devices of designers or production companies, not shown, for communication therewith through the router 14 and the network 12 .
- a storage device 28 capable of storing various data about a workflow is connected to the server 16 .
- the storage device 28 stores contents data, data to be output (hereinafter referred to as “output data”), e.g., platemaking data, printing plate data, or proof data, job ticket files ⁇ e.g., JDF (Job Definition Format) files ⁇ , color profiles, color sample data, etc.
- output data contents data
- data to be output e.g., platemaking data, printing plate data, or proof data
- job ticket files ⁇ e.g., JDF (Job Definition Format) files ⁇
- color profiles color sample data
- FIG. 1 a database with respect to color profiles (hereinafter referred to as “profile DB 30 ”) and a database with respect to spot color information (hereinafter referred to as “spot-color DB 32 ”) are set up in the storage device 28 .
- profile DB 30 a database with respect to color profiles
- spot-color DB 32 spot color information
- the working terminal 18 is a device that performs a preflight process on contents data representing characters, figures, patterns, photographs, etc. and then generating data per page (page data) from the processed contents data.
- the working terminal 18 also performs an imposing process according to a binding process and a page folding process which have been designated, by referring to the tag information of a job ticket.
- a display device 34 for displaying desired images for various working sequences is connected to the working terminal 18 .
- the display device 34 may comprise a liquid crystal display panel, an organic EL (ElectroLuminescence) display panel, a cathode-ray tube (CRT), or a projector for projecting images onto a screen.
- organic EL ElectroLuminescence
- CRT cathode-ray tube
- the print server 20 performs an RIP (Raster Image Processing) process on platemaking data, etc. that have been imposed, and supplies generated output data to the printing press 24 .
- RIP Raster Image Processing
- the print medium 36 may comprise a paper medium such as synthetic paper, thick paper, aluminum-evaporated paper, or the like, a resin medium such as vinyl chloride, PET (polyethylene terephthalate), or the like, or tarpaulin paper, metal sheet, or the like.
- the printing press 24 may comprise a DDCP (Direct Digital Color Proofer), an ink jet color proofer, a low-resolution color laser printer (electrophotographic printer), an ink jet printer, or the like.
- DDCP Direct Digital Color Proofer
- ink jet color proofer a low-resolution color laser printer (electrophotographic printer)
- electrostatic printer an ink jet printer
- the printing press 24 comprises a letterpress printing press, then it produces a print 22 which has images printed on a print medium 36 by applying inks to the print medium 36 through printing plates 38 and intermediate transfer members, not shown.
- the printing press 24 comprises a digital printing press, it can directly produce a print 22 without the need for generating printing plates 38 .
- the digital printing press may comprise an ink jet printing press, a wide-format printing press, an ink jet color proofer, a color laser printer, or the like.
- the server 16 , the working terminal 18 , and the display device 34 jointly make up the color reproduction assisting system 40 for reproducing a color (designated color to be described later) designated by a color sample such as a color chip or the like.
- FIG. 2 shows in electric block form the working terminal 18 shown in FIG. 1 .
- the working terminal 18 basically comprises a computer having a terminal controller 50 , a terminal I/F 52 , an input unit 54 , a display I/F 56 , and a terminal memory 58 (storage medium).
- the terminal I/F 52 is an interface for sending electric signals to and receiving electric signals from an external apparatus.
- the working terminal 18 can acquire various data, e.g., evaluation result data 64 , from the server 16 ( FIG. 1 ), and can supply various data, e.g., printing conditions 60 , to the server 16 .
- the input unit 54 comprises various input devices including a mouse, a track ball, a keyboard, a touch sensor, etc.
- the display I/F 56 is an interface for supplying display control signals to the display device 34 .
- the display device 34 displays various images including a window W1 ( FIG. 5 ), a window W2 ( FIG. 7A or the like), and a window W3 ( FIG. 10 or the like).
- the terminal memory 58 stores programs and data required for the terminal controller 50 to control various components of the working terminal 18 .
- the terminal memory 58 stores a plurality of printing conditions 60 , designated color information 62 , and evaluation result data 64 .
- the terminal controller 50 comprises an information processing unit, i.e., a processor, such as a CPU (Central Processing Unit) or the like.
- the terminal controller 50 reads out and executes programs stored in the terminal memory 58 thereby to carry out functions including a display screen generator 66 .
- FIG. 3 shows in electric block form the server 16 shown in FIG. 1 .
- the server 16 basically comprises a computer having a controller 70 , a communication I/F 72 , a connection I/F 74 , and a memory 76 (storage medium).
- the communication I/F 72 is an interface for sending electric signals to and receiving electric signals from an external apparatus.
- the server 16 can acquire various data, e.g., printing conditions 60 , from the working terminal 18 ( FIG. 1 ), and can supply various data, e.g., evaluation result data 64 , to the working terminal 18 .
- connection I/F 74 is an interface for sending data files to and receiving data files from the storage device 28 .
- the storage device 28 can supply a color profile 78 related to printing conditions 60 , for example, to the server 16 through the connection I/F 74 .
- the memory 76 stores programs and data required for the controller 70 to control various components of the server 16 .
- the memory 76 stores a plurality of color profiles 78 and colorimetric value data 80 .
- the memory 76 may comprise a non-transitory computer-readable storage medium.
- the computer-readable storage medium comprises a portable medium such as a magnetooptic disk, a ROM, a CD-ROM, a flash memory, or the like, or a storage medium such as a hard disk or the like incorporated in a computer system.
- the storage medium also includes a medium for dynamically holding programs for a short period of time, or a medium for holding programs for a certain period of time.
- the controller 70 comprises an information processing unit such as a CPU or the like.
- the controller 70 reads out and executes programs stored in the memory 76 thereby to carry out functions including a data acquirer 82 and a color reproduction characteristics evaluator 84 .
- the data acquirer 82 acquires various data for use in an evaluating process carried out by the color reproduction characteristics evaluator 84 .
- the data acquirer 82 includes a printing condition acquirer 86 for acquiring a plurality of printing conditions 60 ( FIG. 2 ) and a designated color information acquirer 88 for acquiring designated color information 62 .
- the “printing conditions” referred to above refer to composite conditions representing a combination of at least one condition item about printing.
- Condition items include a condition name (including the name of a data file), the type and name of the printing press 24 , the type and size of the print medium 36 , a plate size, color plates, a binding process, the type and customer name of a color profile 78 , and the type of a job.
- the condition items may include not only data directly involved in a printing process, but also data (so-called meta-data) ancillary to those data.
- condition items include, for example, the printing press 24 , the print medium 36 , the printing plates 38 , inks, a halftone dot type, a resolution, a screen ruling, an angle set, and color converting conditions including a dot gain curve, a color profile 78 , etc.
- the “designated color information” referred to above is information with respect to a color (hereinafter referred to as “designated color”) designated by a color sample such as a color chip or the like.
- the designated color information includes not only a color sample itself, but also colorimetric values or type thereof.
- Colorimetric values represent, for example, tristimulus values X, Y, Z, device-independent data including values L*, a*, b* of a uniform color space, and device-dependent data including values R, G, B and values C, M, Y, K.
- the type of a color sample includes a manufacturer name, a color sample number, etc.
- the color reproduction characteristics evaluator 84 carries out an evaluating process with respect to the reproducibility of a designated color.
- the color reproduction characteristics evaluator 84 includes a reproducibility judging section 90 for judging whether a designated color can be reproduced under each printing condition 60 , a substitute color determiner 92 for determining a substitute color that is different from a designated color under predetermined conditions, and a data generator 94 for generating evaluation result data 64 based on the result of the evaluating process.
- the color reproduction assisting system 40 is configured as described above. Operation of the working terminal 18 shown in FIG. 2 and the server 16 shown in FIG. 3 will be described in detail below with reference to a flowchart shown in FIG. 4 .
- step S 1 shown in FIG. 4 the working terminal 18 makes various settings through an input screen 100 (see FIG. 5 ).
- the display screen generator 66 In response to an instruction for starting to make settings, the display screen generator 66 generates display data for the input screen 100 , and then supplies the generated display data to the display I/F 56 .
- the display device 34 displays a window W1 including the input screen 100 based on the display data from the display I/F 56 .
- the input screen 100 includes a first setting field 102 , a second setting field 104 , and a button 106 labeled “START”.
- the operator of the working terminal 18 can operate the input unit 54 ( FIG. 2 ) to make various settings in the first setting field 102 or the second setting field 104 .
- the first setting field 102 includes a list 108 (hereinafter referred to as “condition list 108 ”) of printing conditions 60 to be evaluated and a button group 110 having buttons labeled “ADD” and “DELETE”.
- the condition list 108 includes a subfield 112 showing degrees of importance on a left side and a subfield 113 showing names on a right side.
- the subfield 113 shows the name of at least one printing condition 60 .
- the subfield 112 enumerates “CONDITION A”, “CONDITION B”, “CONDITION C”, “CONDITION D”, and “CONDITION E”.
- the subfield 112 shows an array of checkboxes 114 associated with respective printing conditions 60 listed in the subfield 113 .
- the operator may operate the button group 110 to add a new printing condition 60 to the subfield 113 and to delete a printing condition 60 from the subfield 113 .
- the second setting field 104 includes a text box group 116 , a radio button group 118 , and a pull-down menu group 120 .
- the text box group 116 has text boxes for setting colorimetric values of a designated color.
- the radio button group 118 has radio buttons 118 a , 118 b , 118 c , 118 d for indicating values L*, a*, b*, values R, G, B, values C, M, Y, K, and spot-color values, respectively.
- the pull-down menu group 120 has pull-down menus 120 b , 120 c , 120 d for setting names of color profiles 78 .
- the operator can enter values L*, a*, b* of a CIELAB color system as representing a designated color, using the text boxes of the text box group 116 .
- the operator can enter values R, G, B of a device-depending color space as representing a designated color, using the text boxes of the text box group 116 .
- the operator also sets the name of a color profile 78 , i.e., “sRGB”, registered in the profile DB 30 ( FIG. 1 ) using the pull-down menu 120 b.
- the operator can enter values C, M, Y, K of a device-depending color space as representing a designated color, using the text boxes of the text box group 116 .
- the operator also sets the name of a color profile 78 , i.e., “ISO Coated”, registered in the profile DB 30 using the pull-down menu 120 c.
- the operator can enter values of a spot color as representing a designated color, using the text boxes of the text box group 116 .
- the operator also sets the name of the spot color, i.e., “spot-color-A”, registered in the spot-color DB 32 ( FIG. 1 ) using the pull-down menu 120 d.
- the terminal controller 50 judges whether the operator has clicked on the “START” button 106 using the input unit 54 or not. On condition that the terminal controller 50 judges that the operator has clicked on the “START” button 106 , then control goes to step S 2 .
- step S 2 the color reproduction assisting system 40 performs a transmitting and receiving process on a plurality of printing conditions 60 .
- the terminal controller 50 Prior to the transmitting and receiving process, the terminal controller 50 temporarily stores a plurality of printing conditions 60 in the terminal memory 58 .
- the working terminal 18 transmits communication data including the printing conditions 60 to the server 16 through the terminal I/F 52 .
- the server 16 receives the communication data transmitted through the LAN 26 and the communication I/F 72 .
- the controller 70 acquires the printing conditions 60 included in the communication data.
- five conditions i.e., “CONDITION A”, “CONDITION B”, “CONDITION C”, “CONDITION D”, and “CONDITION E”, are acquired as the printing conditions 60 . Since the checkboxes 114 corresponding to “CONDITION A” and “CONDITION B” are ticked in FIG. 5 , higher degrees of importance are given to these printing conditions 60 .
- step S 3 the color reproduction assisting system 40 performs a transmitting and receiving process on designated color information 62 .
- the terminal controller 50 Prior to the transmitting and receiving process, the terminal controller 50 temporarily stores designated color information 62 in the terminal memory 58 .
- the working terminal 18 transmits communication data including the designated color information 62 to the server 16 through the terminal I/F 52 .
- the server 16 receives the communication data transmitted through the LAN 26 and the communication I/F 72 .
- the controller 70 acquires the designated color information 62 included in the communication data.
- the designated color information 62 may be acquired not only by a manual process using the input screen 100 , but also automatically as color sample information contained in a job ticket, for example.
- step S 4 the color reproduction characteristics evaluator 84 compares and evaluates the reproducibility of the designated color under the printing conditions 60 .
- the controller 70 refers to the profile DB 30 set up in the storage device 28 , and reads out color profiles 78 related to the respective printing conditions 60 .
- the controller 70 refers to the profile DB 30 or the spot-color DB 32 set up in the storage device 28 , and acquires colorimetric value data 80 , i.e., values L*, a*, b*, related to the designated color information 62 .
- the reproducibility judging section 90 judges whether the single designated color can be reproduced under the printing conditions 60 or not. Prior to the judgment, the reproducibility judging section 90 defines the ranges of gamuts Ga through Ge under the printing conditions 60 using color conversion tables which the color profiles 78 have.
- FIG. 6 is a graph showing the relationship between the gamuts Ga through Ge and a designated color under the printing conditions 60 .
- the graph shown in FIG. 6 has a horizontal axis representing a* and a vertical axis representing b*.
- the ranges of the gamuts Ga through Ge are partly omitted from illustration, and are shown as exaggerated in size.
- the solid-line curve represents a portion of a boundary Ba of the gamut Ga under “CONDITION A”.
- the shorter-dot-line curve represents a portion of a boundary Bb of the gamut Gb under “CONDITION B”.
- the dot-and-dash-line curve represents a portion of a boundary Bc of the gamut Gc under “CONDITION C”.
- the longer-dot-line curve represents a portion of a boundary Bd of the gamut Gd under “CONDITION D”.
- the two-dot-and-dash-line curve represents a portion of a boundary Be of the gamut Ge under “CONDITION E”.
- the reproducibility judging section 90 judges whether the designated color can be reproduced or not by referring to the positional relationship between the gamuts Ga through Ge and a single colorimetric value, e.g., DC1.
- the three dots shown in FIG. 6 correspond to colorimetric values DC1, DC2, DC3, respectively of the designated color. Though only one designated color is selected in reality, the colorimetric values DC1, DC2, DC3 thereof are simultaneously shown for illustrative purposes.
- the data generator 94 generates evaluation result data 64 from the judgment result produced by the reproducibility judging section 90 .
- the evaluation result data 64 indicate that on condition the designated color has the colorimetric value DC1, then it can be reproduced under “CONDITION A”, “CONDITION B”, “CONDITION C”, “CONDITION D”, and “CONDITION E”.
- step S 5 the color reproduction assisting system 40 performs a transmitting and receiving process on the evaluation result data 64 .
- the server 16 Prior to the transmitting and receiving process, the server 16 temporarily stores the evaluation result data 64 in the memory 76 .
- the server 16 then transmits communication data including the evaluation result data 64 through the communication I/F 72 to the working terminal 18 .
- the working terminal 18 receives the communication data through the LAN 26 and the terminal I/F 52 . Thereafter, the terminal controller 50 temporarily stores the evaluation result data 64 included in the communication data in the terminal memory 58 .
- step S 6 the working terminal 18 displays an evaluation result (particularly, a judgment result) represented by the evaluation result data 64 acquired in step S 5 on the display device 34 .
- the display screen generator 66 generates display data for an evaluation result screen 140 (see FIG. 7A ), and then supplies the generated display data through the display I/F 56 to the display device 34 , which displays a new window W2 including the evaluation result screen 140 .
- the evaluation result screen 140 includes a list 142 (hereinafter referred to as “result list 142 ”) of evaluation results under the respective printing conditions 60 , a reproduction ratio indicating field 144 for quantitatively indicating the reproduction ratio of a designated color, and a button 146 labeled “CLOSE”.
- the result list 142 includes a subfield 150 showing allotted degrees of importance on a left side, a subfield 151 showing condition names, and a subfield 152 showing judgment results.
- the subfield 151 shows the same details as those shown in the subfield 113 ( FIG. 5 ), i.e., the enumerated names of the five printing conditions 60 illustrated in FIG. 5 .
- the subfield 150 shows circles 154 in locations associated respectively with “CONDITION A” and “CONDITION B”. The circles 154 correspond respectively to the printing conditions 60 whose checkboxes 114 ( FIG. 5 ) are ticked.
- the subfield 152 shows judgment results about whether the designated color can be reproduced under the printing conditions 60 or not. On condition that the designated color has the colorimetric value DC1 (see FIG. 6 ), then the designated color belongs to every one of the gamuts Ga through Ge. In this case, the subfield 152 shows “OK”, indicating that the designated color can be reproduced, in locations associated respectively with “CONDITION A”, “CONDITION B”, “CONDITION C”, “CONDITION D”, and “CONDITION E”.
- the reproduction ratio indicating field 144 shows “OVERALL 100% (5/5)” in its upper tier, which indicates a reproduction ratio about all the printing conditions 60 (five printing conditions in FIG. 7A ) to be evaluated.
- the reproduction ratio indicating field 144 shows “IMPORTANT 100% (2/2)” in its lower tier, which indicates a reproduction ratio about those printing conditions 60 to be evaluated whose degrees of importance are higher (two printing conditions 60 , i.e., “CONDITION A” and “CONDITION B”).
- the display device 34 displays a window W2 including an evaluation result screen 140 shown in FIG. 7B , rather than the evaluation result screen 140 shown in FIG. 7A .
- the evaluation result screen 140 shown in FIG. 7B includes a result list 142 having subfields 150 , 151 , 152 , a reproduction ratio indicating field 144 , and a button 146 , which are identical to those shown in FIG. 7A .
- a result list 142 having subfields 150 , 151 , 152 , a reproduction ratio indicating field 144 , and a button 146 , which are identical to those shown in FIG. 7A .
- the subfield 152 shows “OK”, indicating that the designated color can be reproduced, in locations associated respectively with “CONDITION A”, “CONDITION B”, “CONDITION C”, and “CONDITION D”, and shows “N/A”, indicating that the designated color cannot be reproduced, in a location associated with “CONDITION E”, and the reproduction ratio indicating field 144 shows “OVERALL 80% (4/5)” in its upper tier although it shows “IMPORTANT 100% (2/2)” in its lower tier.
- step S 7 shown in FIG. 4 the operator confirms the details shown in the evaluation result screens 140 shown in FIGS. 7A and 7B , and judges whether the printing conditions 60 and the designated color information 62 should be finalized as they are or not.
- control goes back to step S 1 and repeats steps S 1 through S 7 , i.e., the operator makes settings in the first setting field 102 and the second setting field 104 and the reproducibility of the designated color is evaluated, thereby selecting optimum printing conditions 60 and designated color information 62 .
- the operation of the color reproduction assisting system 40 comes to an end.
- the printing press 24 produces a print 22 that has images on a print medium 36 , based on the output data supplied from the print server 20 .
- the designated color is faithfully reproduced in a certain area on the print 22 .
- the color reproduction assisting system 40 can perform a function to search for a substitute color.
- the function to search for a substitute color will be described below.
- the “substitute color” refers to a color as a substitute for a designated color, and represents a color in the vicinity of a designated color.
- the display device 34 displays a window W2 including an evaluation result screen 140 shown in FIG. 8 , rather than the evaluation result screen 140 shown in FIG. 7A .
- the evaluation result screen 140 shown in FIG. 8 includes a result list 142 having subfields 150 , 151 , 152 , a reproduction ratio indicating field 144 , and a button 146 , which are identical to those shown in FIG. 7A .
- a result list 142 having subfields 150 , 151 , 152 , a reproduction ratio indicating field 144 , and a button 146 , which are identical to those shown in FIG. 7A .
- the subfield 152 shows “OK”, indicating that the designated color can be reproduced, in locations associated respectively with “CONDITION A”, “CONDITION D”, and “CONDITION E”, and shows “N/A”, indicating that the designated color cannot be reproduced, in locations associated respectively with “CONDITION B” and “CONDITION C”, and the reproduction ratio indicating field 144 shows “OVERALL 60% (3/5)” in its upper tier and shows “IMPORTANT 50% (1/2)” in its lower tier.
- the evaluation result screen 140 also includes a button 148 labeled “SEARCH FOR SUBSTITUTE COLOR” directly above the “CLOSE” button 146 .
- the “SEARCH FOR SUBSTITUTE COLOR” button 148 doubles as an indicator for letting the operator know that there are “CONDITION B” and “CONDITION C” under which the designated color cannot be reproduced, among the printing conditions 60 .
- the color reproduction characteristics evaluator 84 further carries out an evaluating process with respect to the reproducibility of a designated color.
- the details of the operation sequence up to the evaluating process are basically identical to steps S 1 through S 4 ( FIG. 4 ), and will not be described below.
- the substitute color determiner 92 determines, under a certain condition, a substitute color in order to increase the number of printing conditions 60 under which the designated color can be reproduced.
- the “certain condition” refers to a situation in which there is at least one of the printing conditions 60 under which the designated color cannot be reproduced. A process of searching for a substitute color will be described below with reference to FIGS. 9A and 9B .
- FIGS. 9A and 9B show at an enlarged scale a graph that corresponds to an area around the colorimetric value DC3 shown in FIG. 6 .
- FIG. 9A illustrates an example wherein the number of printing conditions 60 under which the designated color can be reproduced is incremented by 1.
- the substitute color determiner 92 determines a color whose color difference from the designated color is minimum as a substitute color.
- the substitute color determiner 92 determines a colorimetric value RC31 that is present on the boundary Bb and spaced from the colorimetric value DC3 by a minimum distance, as a substitute color.
- the substitute color determiner 92 can be said to have determined a substitute color so that the designated color can be reproduced under all the printing conditions 60 whose degrees of importance are higher, i.e., “CONDITION A” and “CONDITION B”.
- FIG. 9B illustrates an example wherein the number of printing conditions 60 under which the designated color can be reproduced is incremented by 2.
- the substitute color determiner 92 determines a color which can be reproduced under all the printing conditions 60 and whose color difference from the designated color is minimum, as a substitute color.
- the substitute color determiner 92 determines a colorimetric value RC32 that is present on the boundary Bc and spaced from the colorimetric value DC3 by a minimum distance, as a substitute color.
- step S 6 the working terminal 18 displays an evaluation result (particularly, a search result) acquired in step S 5 on the display device 34 .
- the display screen generator 66 generates display data for a search result screen 160 , and then supplies the generated display data through the display I/F 56 to the display device 34 , which displays a new window W3 including the search result screen 160 .
- the search result screen 160 shown in FIG. 10 includes a search display field 162 for showing a search result about the designated color and a button 164 labeled “CLOSE”.
- the search display field 162 includes a result list 142 having subfields 150 , 151 , 152 , which are similar to those shown in FIG. 7A or the like.
- the search display field 162 also includes a colorimetric value display field 166 for showing colorimetric values of designated colors and substitute colors, a color difference display field 168 for showing a color difference, and a color patch group 170 .
- the colorimetric value display field 166 includes a subfield 172 showing types of colorimetric values on a left side, a subfield 173 showing colorimetric values DC3 ( FIG. 6 ) of designated colors in the middle, and a subfield 174 showing colorimetric values RC31 ( FIG. 9A ) of substitute colors on a right side.
- the color difference display field 168 shows the color difference Le between a colorimetric value DC3 and a colorimetric value RC31.
- the color patch group 170 includes a color patch 170 d of a designated color, i.e., a color representing a colorimetric value DC3, and a color patch 170 r of a substitute color, i.e., a color representing a colorimetric value RC31, the color patches 170 d , 170 r being arranged in a juxtaposed array.
- the visible information thus displayed by the color difference display field 168 allows the operator to grasp the relationship between a designated color and a substitute color at a glance.
- the search result screen 160 shown in FIG. 10 switches to a search result screen 160 shown in FIG. 11 , changing details of the search display field 162 .
- a comparison between FIGS. 10 and 11 indicates that details displayed in the subfields 152 , 174 and the color difference display fields 168 are different from each other.
- the displayed color of the color patch 170 r is also slightly changed in a case where the search result screen 160 shown in FIG. 10 switches to the search result screen 160 shown in FIG. 11 .
- the operator Since a plurality of substitute colors (colorimetric values RC31, RC32) obtained according to difference color searching processes are presented at a time, the operator is given a wider choice of alternatives and may find it more convenient.
- Various known algorithms are available for the color searching processes.
- the target (evaluation index) of a minimization algorithm may be not only color difference, but also lightness and saturation.
- the color reproduction assisting system 40 includes the printing condition acquirer 86 that acquires a plurality of printing conditions 60 , the designated color information acquirer 88 that acquires designated color information 62 with respect to a single designated color, the reproducibility judging section 90 that judges whether the designated color specified from the designated color information 62 can be reproduced under the printing conditions 60 , the substitute color determiner 92 that determines a substitute color that is different from the designated color in order to increase the number of printing conditions 60 under which the designated color can be reproduced on condition that at least one of the printing conditions 60 under which the designated color cannot be reproduced is judged as being present, and the display device 34 that displays visible information (the colorimetric value display field 166 , the color difference display field 168 , and the color patch group 170 ) with respect to the substitute color.
- the color reproduction assisting system 40 thus configured is capable of presenting particularly useful information in reproducing the single designated color under the printing conditions 60 .
- the color reproduction assisting system 200 has a working terminal 202 and a display device 34 .
- the working terminal 202 includes a terminal controller 204 instead of the terminal controller 50 ( FIG. 2 ), and is otherwise identical to the working terminal 18 .
- the terminal controller 204 reads out and executes programs stored in the terminal memory 58 thereby to carry out functions including the display screen generator 66 , the data acquirer 82 , and the color reproduction characteristics evaluator 84 .
- the working terminal 202 operates to evaluate the reproducibility of a designated color.
- the color reproduction assisting system 200 thus configured offers the same advantages as those of the color reproduction assisting system 40 according to the above embodiment.
- steps S 2 , S 3 shown in FIG. 4 the working terminal 202 needs to send a transmission request to the server 16 for acquiring a plurality of color profiles 78 and colorimetric data 80 .
- the transmitting and receiving process about the evaluation result in step S 5 shown in FIG. 4 is not necessary.
Abstract
Description
- This application is based upon and claims the benefit of priority from Japanese Patent Application No. 2013-184868 filed on Sep. 6, 2013, the contents of which are incorporated herein by reference.
- 1. Field of the Invention
- The present invention relates to a color reproduction assisting system, a color reproduction assisting method, and a non-transitory storage medium for assisting in the reproduction of designated colors on a print.
- 2. Description of the Related Art
- Heretofore, there has been known in the printing field a technology for finely adjusting a color of an image into essential agreement with a color (hereinafter referred to as “designated color”) designated by a color sample such as a color chip or the like. For faithfully reproducing a designated color, it is important to judge whether the designated color is present within the gamut of a printing press or not. Various processes have been proposed to predict whether a designated color can be reproduced or not and let the operator know the predicted result.
- Japanese Laid-Open Patent Publication No. 2011-166731 discloses a process of displaying a list of the attributes and items of print mediums and the distances up to gamut boundaries. The operator can select the type of a print medium that is suitable for reproducing a designated color by confirming the details of the displayed list.
- The present invention has been made with respect to the technical concept disclosed in Japanese Laid-Open Patent Publication No. 2011-166731. It is an object of the present invention to provide a color reproduction assisting system, a color reproduction assisting method, and a non-transitory storage medium which are capable of presenting the operator with information that is especially useful for reproducing a single designated color under a plurality of printing conditions.
- According to the present invention, there is provided a color reproduction assisting system comprising a printing condition acquirer that acquires a plurality of printing conditions, a designated color information acquirer that acquires designated color information with respect to a single designated color, a reproducibility judging section that judges whether the designated color specified from the designated color information acquired by the designated color information acquirer can be reproduced under the printing conditions acquired by printing condition acquirer or not, a substitute color determiner that determines a substitute color that is different from the designated color in order to increase number of the printing conditions under which the designated color can be reproduced on condition that at least one of the printing conditions under which the designated color cannot be reproduced is judged as being present by the reproducibility judging section, and a display device that displays visible information with respect to the substitute color determined by the substitute color determiner.
- Thus, on condition that at least one of the printing conditions under which the designated color cannot be reproduced is judged as being present, the reproducibility judging section is provided for determining a substitute color that is different from the designated color in order to increase the number of the printing conditions under which the designated color can be reproduced, and the display device is provided for displaying visible information with respect to the substitute color. Consequently, the color reproduction assisting system is capable of presenting particularly useful information to the operator thereof in reproducing the single designated color under the printing conditions. The color reproduction assisting system is capable of presenting particularly useful information in reproducing the single designated color under the printing conditions.
- The substitute color determiner may preferably determine a color whose color difference from the designated color is minimum as the substitute color on condition that the number of the printing conditions under which the designated color can be reproduced remains the same.
- The display device may preferably display a color patch of the designated color and a color patch of the substitute color, arranged in a juxtaposed array as the visible information.
- The printing condition acquirer may further acquire degrees of importance allotted to the printing conditions, respectively, and the substitute color determiner may preferably determine the substitute color so that the designated color can be reproduced under all printing conditions whose degrees of importance are higher than other printing conditions.
- According to the present invention, there is also provided a color reproduction assisting method comprising the steps, to be carried out by at least one computer, of acquiring a plurality of printing conditions, acquiring designated color information with respect to a single designated color, judging whether the designated color specified from the designated color information can be reproduced under the printing conditions that are acquired or not, determining a substitute color that is different from the designated color in order to increase number of the printing conditions under which the designated color can be reproduced on condition that at least one of the printing conditions under which the designated color cannot be reproduced is judged as being present, and displaying visible information on a display device with respect to the substitute color that is determined.
- According to the present invention, there is further provided a non-transitory storage medium storing a program for enabling at least one computer to carry out the steps of acquiring a plurality of printing conditions, acquiring designated color information with respect to a single designated color, judging whether the designated color specified from the designated color information can be reproduced under the printing conditions that are acquired or not, determining a substitute color that is different from the designated color in order to increase number of the printing conditions under which the designated color can be reproduced on condition that at least one of the printing conditions under which the designated color cannot be reproduced is judged as being present, and displaying visible information on a display device with respect to the substitute color that is determined.
- According to the present invention, there is further provided a program for enabling at least one computer to carry out the steps of acquiring a plurality of printing conditions, acquiring designated color information with respect to a single designated color, judging whether the designated color specified from the designated color information can be reproduced under the printing conditions that are acquired or not, determining a substitute color that is different from the designated color in order to increase the number of the printing conditions under which the designated color can be reproduced on condition that at least one of the printing conditions under which the designated color cannot be reproduced is judged as being present, and displaying visible information on a display device with respect to the substitute color that is determined.
- With the color reproduction assisting system, the color reproduction assisting method, and the non-transitory storage medium described above, on condition that at least one of the printing conditions under which the designated color cannot be reproduced is judged as being present, a substitute color that is different from the designated color is determined in order to increase the number of the printing conditions under which the designated color can be reproduced, and visible information with respect to the substitute color is displayed. Consequently, particularly useful information can be presented to the operator thereof in reproducing the single designated color under the printing conditions.
- The above and other objects, features, and advantages of the present invention will become more apparent from the following description when taken in conjunction with the accompanying drawings in which preferred embodiments of the present invention are shown by way of illustrative example.
-
FIG. 1 is a block diagram showing an overall configuration of a print production system incorporating a color reproduction assisting system according to an embodiment of the present invention; -
FIG. 2 is an electric block diagram of a working terminal shown inFIG. 1 ; -
FIG. 3 is an electric block diagram of a server shown inFIG. 1 ; -
FIG. 4 is a flowchart of an operation sequence of the working terminal shown inFIG. 2 and the server shown inFIG. 3 ; -
FIG. 5 is a view showing an image representing an input screen for entering printing conditions and designated color information; -
FIG. 6 is a graph showing the relationship between gamuts and a designated color under the printing conditions; -
FIG. 7A is a view showing a first image representing an evaluation result screen that shows evaluated color reproduction characteristics; -
FIG. 7B is a view showing a second image representing an evaluation result screen; -
FIG. 8 is a view showing a third image representing an evaluation result screen; -
FIGS. 9A and 9B are diagrams illustrating a process of searching for a substitute color; -
FIG. 10 is a view showing a first image representing a search result screen that shows substitute colors that have been found; -
FIG. 11 is a view showing a second image representing a search result screen that shows substitute colors that have been found; and -
FIG. 12 is an electric block diagram of a color reproduction assisting system according to a modification. - A color reproduction assisting method according to a preferred embodiment of the present invention in relation to a color reproduction assisting system and a color reproduction assisting program for carrying out the color reproduction assisting method will be described in detail below with reference to the accompanying drawings.
-
FIG. 1 shows in block form an overall configuration of aprint production system 10 incorporating a colorreproduction assisting system 40 according to an embodiment of the present invention. - As shown in
FIG. 1 , theprint production system 10 includes arouter 14 serving as a device for connection to anetwork 12, aserver 16 which is accessible through thenetwork 12 from terminal devices, not shown, belonging to external networks, aworking terminal 18 for performing various information processing processes on contents data acquired from theserver 16, etc., aprint server 20 having a printing process function, and aprinting press 24 for producing aprint 22 based on output data sent from theprint server 20. - The
server 16 is an apparatus that plays a central role in the workflow management in theprint production system 10. Theserver 16 is connected to theworking terminal 18 and theprint server 20 for communication therewith through a LAN (Local Area Network) 26 set up in theprint production system 10. Theserver 16 may be connected to various terminal devices of designers or production companies, not shown, for communication therewith through therouter 14 and thenetwork 12. - A
storage device 28 capable of storing various data about a workflow is connected to theserver 16. Thestorage device 28 stores contents data, data to be output (hereinafter referred to as “output data”), e.g., platemaking data, printing plate data, or proof data, job ticket files {e.g., JDF (Job Definition Format) files}, color profiles, color sample data, etc. InFIG. 1 , a database with respect to color profiles (hereinafter referred to as “profile DB 30”) and a database with respect to spot color information (hereinafter referred to as “spot-color DB 32”) are set up in thestorage device 28. - The
working terminal 18 is a device that performs a preflight process on contents data representing characters, figures, patterns, photographs, etc. and then generating data per page (page data) from the processed contents data. Theworking terminal 18 also performs an imposing process according to a binding process and a page folding process which have been designated, by referring to the tag information of a job ticket. - A
display device 34 for displaying desired images for various working sequences is connected to theworking terminal 18. Thedisplay device 34 may comprise a liquid crystal display panel, an organic EL (ElectroLuminescence) display panel, a cathode-ray tube (CRT), or a projector for projecting images onto a screen. - The
print server 20 performs an RIP (Raster Image Processing) process on platemaking data, etc. that have been imposed, and supplies generated output data to theprinting press 24. - Based on the output data supplied from the
print server 20, theprinting press 24 produces aprint 22 that has images on aprint medium 36. Theprint medium 36 may comprise a paper medium such as synthetic paper, thick paper, aluminum-evaporated paper, or the like, a resin medium such as vinyl chloride, PET (polyethylene terephthalate), or the like, or tarpaulin paper, metal sheet, or the like. - On condition that the
printing press 24 comprises a proofer, then it may comprise a DDCP (Direct Digital Color Proofer), an ink jet color proofer, a low-resolution color laser printer (electrophotographic printer), an ink jet printer, or the like. - On condition that the
printing press 24 comprises a letterpress printing press, then it produces aprint 22 which has images printed on aprint medium 36 by applying inks to theprint medium 36 throughprinting plates 38 and intermediate transfer members, not shown. - On condition that the
printing press 24 comprises a digital printing press, it can directly produce aprint 22 without the need for generatingprinting plates 38. The digital printing press may comprise an ink jet printing press, a wide-format printing press, an ink jet color proofer, a color laser printer, or the like. - The
server 16, the workingterminal 18, and thedisplay device 34 jointly make up the colorreproduction assisting system 40 for reproducing a color (designated color to be described later) designated by a color sample such as a color chip or the like. -
FIG. 2 shows in electric block form the workingterminal 18 shown inFIG. 1 . As shown inFIG. 2 , the workingterminal 18 basically comprises a computer having aterminal controller 50, a terminal I/F 52, aninput unit 54, a display I/F 56, and a terminal memory 58 (storage medium). - The terminal I/
F 52 is an interface for sending electric signals to and receiving electric signals from an external apparatus. The workingterminal 18 can acquire various data, e.g.,evaluation result data 64, from the server 16 (FIG. 1 ), and can supply various data, e.g.,printing conditions 60, to theserver 16. - The
input unit 54 comprises various input devices including a mouse, a track ball, a keyboard, a touch sensor, etc. The display I/F 56 is an interface for supplying display control signals to thedisplay device 34. In a case where thedisplay device 34 is supplied with display control signals, thedisplay device 34 displays various images including a window W1 (FIG. 5 ), a window W2 (FIG. 7A or the like), and a window W3 (FIG. 10 or the like). - The
terminal memory 58 stores programs and data required for theterminal controller 50 to control various components of the workingterminal 18. InFIG. 2 , theterminal memory 58 stores a plurality ofprinting conditions 60, designatedcolor information 62, andevaluation result data 64. - The
terminal controller 50 comprises an information processing unit, i.e., a processor, such as a CPU (Central Processing Unit) or the like. Theterminal controller 50 reads out and executes programs stored in theterminal memory 58 thereby to carry out functions including adisplay screen generator 66. -
FIG. 3 shows in electric block form theserver 16 shown inFIG. 1 . As shown inFIG. 3 , theserver 16 basically comprises a computer having acontroller 70, a communication I/F 72, a connection I/F 74, and a memory 76 (storage medium). - The communication I/
F 72 is an interface for sending electric signals to and receiving electric signals from an external apparatus. Theserver 16 can acquire various data, e.g.,printing conditions 60, from the working terminal 18 (FIG. 1 ), and can supply various data, e.g.,evaluation result data 64, to the workingterminal 18. - The connection I/
F 74 is an interface for sending data files to and receiving data files from thestorage device 28. In response to a request from theserver 16, thestorage device 28 can supply acolor profile 78 related toprinting conditions 60, for example, to theserver 16 through the connection I/F 74. - The
memory 76 stores programs and data required for thecontroller 70 to control various components of theserver 16. InFIG. 3 , thememory 76 stores a plurality ofcolor profiles 78 andcolorimetric value data 80. - The
memory 76 may comprise a non-transitory computer-readable storage medium. The computer-readable storage medium comprises a portable medium such as a magnetooptic disk, a ROM, a CD-ROM, a flash memory, or the like, or a storage medium such as a hard disk or the like incorporated in a computer system. The storage medium also includes a medium for dynamically holding programs for a short period of time, or a medium for holding programs for a certain period of time. - The
controller 70 comprises an information processing unit such as a CPU or the like. Thecontroller 70 reads out and executes programs stored in thememory 76 thereby to carry out functions including adata acquirer 82 and a colorreproduction characteristics evaluator 84. - The
data acquirer 82 acquires various data for use in an evaluating process carried out by the colorreproduction characteristics evaluator 84. Specifically, thedata acquirer 82 includes aprinting condition acquirer 86 for acquiring a plurality of printing conditions 60 (FIG. 2 ) and a designatedcolor information acquirer 88 for acquiring designatedcolor information 62. - The “printing conditions” referred to above refer to composite conditions representing a combination of at least one condition item about printing. Condition items include a condition name (including the name of a data file), the type and name of the
printing press 24, the type and size of theprint medium 36, a plate size, color plates, a binding process, the type and customer name of acolor profile 78, and the type of a job. The condition items may include not only data directly involved in a printing process, but also data (so-called meta-data) ancillary to those data. For offset printing, condition items include, for example, theprinting press 24, theprint medium 36, theprinting plates 38, inks, a halftone dot type, a resolution, a screen ruling, an angle set, and color converting conditions including a dot gain curve, acolor profile 78, etc. - The “designated color information” referred to above is information with respect to a color (hereinafter referred to as “designated color”) designated by a color sample such as a color chip or the like. The designated color information includes not only a color sample itself, but also colorimetric values or type thereof. Colorimetric values represent, for example, tristimulus values X, Y, Z, device-independent data including values L*, a*, b* of a uniform color space, and device-dependent data including values R, G, B and values C, M, Y, K. The type of a color sample includes a manufacturer name, a color sample number, etc.
- The color reproduction characteristics evaluator 84 carries out an evaluating process with respect to the reproducibility of a designated color. Specifically, the color
reproduction characteristics evaluator 84 includes areproducibility judging section 90 for judging whether a designated color can be reproduced under eachprinting condition 60, asubstitute color determiner 92 for determining a substitute color that is different from a designated color under predetermined conditions, and adata generator 94 for generatingevaluation result data 64 based on the result of the evaluating process. - The color
reproduction assisting system 40 according to the present embodiment is configured as described above. Operation of the workingterminal 18 shown inFIG. 2 and theserver 16 shown inFIG. 3 will be described in detail below with reference to a flowchart shown inFIG. 4 . - In step S1 shown in
FIG. 4 , the workingterminal 18 makes various settings through an input screen 100 (seeFIG. 5 ). In response to an instruction for starting to make settings, thedisplay screen generator 66 generates display data for theinput screen 100, and then supplies the generated display data to the display I/F 56. Thedisplay device 34 displays a window W1 including theinput screen 100 based on the display data from the display I/F 56. - As shown in
FIG. 5 , theinput screen 100 includes afirst setting field 102, asecond setting field 104, and abutton 106 labeled “START”. The operator of the workingterminal 18 can operate the input unit 54 (FIG. 2 ) to make various settings in thefirst setting field 102 or thesecond setting field 104. - The
first setting field 102 includes a list 108 (hereinafter referred to as “condition list 108”) ofprinting conditions 60 to be evaluated and abutton group 110 having buttons labeled “ADD” and “DELETE”. Thecondition list 108 includes asubfield 112 showing degrees of importance on a left side and asubfield 113 showing names on a right side. - The
subfield 113 shows the name of at least oneprinting condition 60. InFIG. 5 , thesubfield 112 enumerates “CONDITION A”, “CONDITION B”, “CONDITION C”, “CONDITION D”, and “CONDITION E”. Thesubfield 112 shows an array ofcheckboxes 114 associated withrespective printing conditions 60 listed in thesubfield 113. The operator may operate thebutton group 110 to add anew printing condition 60 to thesubfield 113 and to delete aprinting condition 60 from thesubfield 113. - The
second setting field 104 includes atext box group 116, aradio button group 118, and a pull-down menu group 120. - The
text box group 116 has text boxes for setting colorimetric values of a designated color. Theradio button group 118 hasradio buttons down menu group 120 has pull-downmenus radio button 118 a of theradio button group 118, the operator can enter values L*, a*, b* of a CIELAB color system as representing a designated color, using the text boxes of thetext box group 116. - In a case where the operator selects the
radio button 118 b of theradio button group 118, the operator can enter values R, G, B of a device-depending color space as representing a designated color, using the text boxes of thetext box group 116. At this time, the operator also sets the name of acolor profile 78, i.e., “sRGB”, registered in the profile DB 30 (FIG. 1 ) using the pull-down menu 120 b. - In a case where the operator selects the
radio button 118 c of theradio button group 118, the operator can enter values C, M, Y, K of a device-depending color space as representing a designated color, using the text boxes of thetext box group 116. At this time, the operator also sets the name of acolor profile 78, i.e., “ISO Coated”, registered in theprofile DB 30 using the pull-down menu 120 c. - In a case where the operator selects the
radio button 118 d of theradio button group 118, the operator can enter values of a spot color as representing a designated color, using the text boxes of thetext box group 116. At this time, the operator also sets the name of the spot color, i.e., “spot-color-A”, registered in the spot-color DB 32 (FIG. 1 ) using the pull-down menu 120 d. - The
terminal controller 50 judges whether the operator has clicked on the “START”button 106 using theinput unit 54 or not. On condition that theterminal controller 50 judges that the operator has clicked on the “START”button 106, then control goes to step S2. - In step S2, the color
reproduction assisting system 40 performs a transmitting and receiving process on a plurality ofprinting conditions 60. Prior to the transmitting and receiving process, theterminal controller 50 temporarily stores a plurality ofprinting conditions 60 in theterminal memory 58. The workingterminal 18 transmits communication data including theprinting conditions 60 to theserver 16 through the terminal I/F 52. Theserver 16 receives the communication data transmitted through theLAN 26 and the communication I/F 72. - Thereafter, the controller 70 (printing condition acquirer 86) acquires the
printing conditions 60 included in the communication data. InFIG. 5 , five conditions, i.e., “CONDITION A”, “CONDITION B”, “CONDITION C”, “CONDITION D”, and “CONDITION E”, are acquired as the printing conditions 60. Since thecheckboxes 114 corresponding to “CONDITION A” and “CONDITION B” are ticked inFIG. 5 , higher degrees of importance are given to theseprinting conditions 60. - In step S3, the color
reproduction assisting system 40 performs a transmitting and receiving process on designatedcolor information 62. Prior to the transmitting and receiving process, theterminal controller 50 temporarily stores designatedcolor information 62 in theterminal memory 58. The workingterminal 18 transmits communication data including the designatedcolor information 62 to theserver 16 through the terminal I/F 52. Theserver 16 receives the communication data transmitted through theLAN 26 and the communication I/F 72. - Thereafter, the controller 70 (designated color information acquirer 88) acquires the designated
color information 62 included in the communication data. InFIG. 5 , colorimetric values (L*, a*, b*=50, 80, 80) are acquired as the designatedcolor information 62. The designatedcolor information 62 may be acquired not only by a manual process using theinput screen 100, but also automatically as color sample information contained in a job ticket, for example. - In step S4, the color
reproduction characteristics evaluator 84 compares and evaluates the reproducibility of the designated color under the printing conditions 60. Before the reproducibility of the designated color is evaluated, thecontroller 70 refers to theprofile DB 30 set up in thestorage device 28, and reads out color profiles 78 related to therespective printing conditions 60. As necessary, thecontroller 70 refers to theprofile DB 30 or the spot-color DB 32 set up in thestorage device 28, and acquirescolorimetric value data 80, i.e., values L*, a*, b*, related to the designatedcolor information 62. - The
reproducibility judging section 90 judges whether the single designated color can be reproduced under theprinting conditions 60 or not. Prior to the judgment, thereproducibility judging section 90 defines the ranges of gamuts Ga through Ge under theprinting conditions 60 using color conversion tables which the color profiles 78 have. -
FIG. 6 is a graph showing the relationship between the gamuts Ga through Ge and a designated color under the printing conditions 60.FIG. 6 illustrates cross sections of the gamuts Ga through Ge taken along a plane (L*=50) with an L*-axis extending normal thereto. The graph shown inFIG. 6 has a horizontal axis representing a* and a vertical axis representing b*. For illustrative purposes, the ranges of the gamuts Ga through Ge are partly omitted from illustration, and are shown as exaggerated in size. - The solid-line curve represents a portion of a boundary Ba of the gamut Ga under “CONDITION A”. The shorter-dot-line curve represents a portion of a boundary Bb of the gamut Gb under “CONDITION B”. The dot-and-dash-line curve represents a portion of a boundary Bc of the gamut Gc under “CONDITION C”. The longer-dot-line curve represents a portion of a boundary Bd of the gamut Gd under “CONDITION D”. The two-dot-and-dash-line curve represents a portion of a boundary Be of the gamut Ge under “CONDITION E”.
- The
reproducibility judging section 90 judges whether the designated color can be reproduced or not by referring to the positional relationship between the gamuts Ga through Ge and a single colorimetric value, e.g., DC1. The three dots shown inFIG. 6 correspond to colorimetric values DC1, DC2, DC3, respectively of the designated color. Though only one designated color is selected in reality, the colorimetric values DC1, DC2, DC3 thereof are simultaneously shown for illustrative purposes. - Thereafter, the
data generator 94 generatesevaluation result data 64 from the judgment result produced by thereproducibility judging section 90. Theevaluation result data 64 indicate that on condition the designated color has the colorimetric value DC1, then it can be reproduced under “CONDITION A”, “CONDITION B”, “CONDITION C”, “CONDITION D”, and “CONDITION E”. - In step S5, the color
reproduction assisting system 40 performs a transmitting and receiving process on theevaluation result data 64. Prior to the transmitting and receiving process, theserver 16 temporarily stores theevaluation result data 64 in thememory 76. Theserver 16 then transmits communication data including theevaluation result data 64 through the communication I/F 72 to the workingterminal 18. The workingterminal 18 receives the communication data through theLAN 26 and the terminal I/F 52. Thereafter, theterminal controller 50 temporarily stores theevaluation result data 64 included in the communication data in theterminal memory 58. - In step S6, the working
terminal 18 displays an evaluation result (particularly, a judgment result) represented by theevaluation result data 64 acquired in step S5 on thedisplay device 34. Specifically, thedisplay screen generator 66 generates display data for an evaluation result screen 140 (seeFIG. 7A ), and then supplies the generated display data through the display I/F 56 to thedisplay device 34, which displays a new window W2 including theevaluation result screen 140. - As shown in
FIG. 7A , theevaluation result screen 140 includes a list 142 (hereinafter referred to as “result list 142”) of evaluation results under therespective printing conditions 60, a reproductionratio indicating field 144 for quantitatively indicating the reproduction ratio of a designated color, and abutton 146 labeled “CLOSE”. Theresult list 142 includes asubfield 150 showing allotted degrees of importance on a left side, asubfield 151 showing condition names, and asubfield 152 showing judgment results. - The
subfield 151 shows the same details as those shown in the subfield 113 (FIG. 5 ), i.e., the enumerated names of the fiveprinting conditions 60 illustrated inFIG. 5 . Thesubfield 150 showscircles 154 in locations associated respectively with “CONDITION A” and “CONDITION B”. Thecircles 154 correspond respectively to theprinting conditions 60 whose checkboxes 114 (FIG. 5 ) are ticked. - The
subfield 152 shows judgment results about whether the designated color can be reproduced under theprinting conditions 60 or not. On condition that the designated color has the colorimetric value DC1 (seeFIG. 6 ), then the designated color belongs to every one of the gamuts Ga through Ge. In this case, thesubfield 152 shows “OK”, indicating that the designated color can be reproduced, in locations associated respectively with “CONDITION A”, “CONDITION B”, “CONDITION C”, “CONDITION D”, and “CONDITION E”. - The reproduction
ratio indicating field 144 shows “OVERALL 100% (5/5)” in its upper tier, which indicates a reproduction ratio about all the printing conditions 60 (five printing conditions inFIG. 7A ) to be evaluated. The reproductionratio indicating field 144 shows “IMPORTANT 100% (2/2)” in its lower tier, which indicates a reproduction ratio about those printingconditions 60 to be evaluated whose degrees of importance are higher (twoprinting conditions 60, i.e., “CONDITION A” and “CONDITION B”). - On the condition that the designated color has the colorimetric value DC2 (see
FIG. 6 ), then the designated color belongs to the four gamuts Ga through Gd, but does not belong to the gamut Ge. At this time, thedisplay device 34 displays a window W2 including anevaluation result screen 140 shown inFIG. 7B , rather than theevaluation result screen 140 shown inFIG. 7A . - The
evaluation result screen 140 shown inFIG. 7B includes aresult list 142 havingsubfields ratio indicating field 144, and abutton 146, which are identical to those shown inFIG. 7A . In theevaluation result screen 140 shown inFIG. 7B , thesubfield 152 shows “OK”, indicating that the designated color can be reproduced, in locations associated respectively with “CONDITION A”, “CONDITION B”, “CONDITION C”, and “CONDITION D”, and shows “N/A”, indicating that the designated color cannot be reproduced, in a location associated with “CONDITION E”, and the reproductionratio indicating field 144 shows “OVERALL 80% (4/5)” in its upper tier although it shows “IMPORTANT 100% (2/2)” in its lower tier. - In step S7 shown in
FIG. 4 , the operator confirms the details shown in the evaluation result screens 140 shown inFIGS. 7A and 7B , and judges whether theprinting conditions 60 and the designatedcolor information 62 should be finalized as they are or not. - On condition that the operator judges that the
printing conditions 60 and the designatedcolor information 62 should not be finalized (S7: NO), then control goes back to step S1 and repeats steps S1 through S7, i.e., the operator makes settings in thefirst setting field 102 and thesecond setting field 104 and the reproducibility of the designated color is evaluated, thereby selectingoptimum printing conditions 60 and designatedcolor information 62. - On condition that the operator judges that the
printing conditions 60 and the designatedcolor information 62 should be finalized (S7: YES), then the operation of the colorreproduction assisting system 40 comes to an end. Theprinting press 24 produces aprint 22 that has images on aprint medium 36, based on the output data supplied from theprint server 20. As a result, the designated color is faithfully reproduced in a certain area on theprint 22. - The color
reproduction assisting system 40 can perform a function to search for a substitute color. The function to search for a substitute color will be described below. The “substitute color” refers to a color as a substitute for a designated color, and represents a color in the vicinity of a designated color. - On condition that the designated color has the colorimetric value DC3 (see
FIG. 6 ), then the designated color belongs to the three gamuts Ga, Gd, Ge, but does not belong to the two gamuts Gb, Gc. At this time, thedisplay device 34 displays a window W2 including anevaluation result screen 140 shown inFIG. 8 , rather than theevaluation result screen 140 shown inFIG. 7A . - The
evaluation result screen 140 shown inFIG. 8 includes aresult list 142 havingsubfields ratio indicating field 144, and abutton 146, which are identical to those shown inFIG. 7A . In theevaluation result screen 140 shown inFIG. 8 , thesubfield 152 shows “OK”, indicating that the designated color can be reproduced, in locations associated respectively with “CONDITION A”, “CONDITION D”, and “CONDITION E”, and shows “N/A”, indicating that the designated color cannot be reproduced, in locations associated respectively with “CONDITION B” and “CONDITION C”, and the reproductionratio indicating field 144 shows “OVERALL 60% (3/5)” in its upper tier and shows “IMPORTANT 50% (1/2)” in its lower tier. - The
evaluation result screen 140 also includes abutton 148 labeled “SEARCH FOR SUBSTITUTE COLOR” directly above the “CLOSE”button 146. The “SEARCH FOR SUBSTITUTE COLOR”button 148 doubles as an indicator for letting the operator know that there are “CONDITION B” and “CONDITION C” under which the designated color cannot be reproduced, among the printing conditions 60. - In a case where the operator clicks on the “SEARCH FOR SUBSTITUTE COLOR”
button 148, the color reproduction characteristics evaluator 84 further carries out an evaluating process with respect to the reproducibility of a designated color. The details of the operation sequence up to the evaluating process are basically identical to steps S1 through S4 (FIG. 4 ), and will not be described below. - The
substitute color determiner 92 determines, under a certain condition, a substitute color in order to increase the number ofprinting conditions 60 under which the designated color can be reproduced. The “certain condition” refers to a situation in which there is at least one of theprinting conditions 60 under which the designated color cannot be reproduced. A process of searching for a substitute color will be described below with reference toFIGS. 9A and 9B .FIGS. 9A and 9B show at an enlarged scale a graph that corresponds to an area around the colorimetric value DC3 shown inFIG. 6 . -
FIG. 9A illustrates an example wherein the number ofprinting conditions 60 under which the designated color can be reproduced is incremented by 1. On condition that the number (4 inFIG. 9A ) ofprinting conditions 60 under which the designated color can be reproduced remains the same, then thesubstitute color determiner 92 determines a color whose color difference from the designated color is minimum as a substitute color. As a result, thesubstitute color determiner 92 determines a colorimetric value RC31 that is present on the boundary Bb and spaced from the colorimetric value DC3 by a minimum distance, as a substitute color. - In the example shown in
FIG. 9A , thesubstitute color determiner 92 can be said to have determined a substitute color so that the designated color can be reproduced under all theprinting conditions 60 whose degrees of importance are higher, i.e., “CONDITION A” and “CONDITION B”. -
FIG. 9B illustrates an example wherein the number ofprinting conditions 60 under which the designated color can be reproduced is incremented by 2. Thesubstitute color determiner 92 determines a color which can be reproduced under all theprinting conditions 60 and whose color difference from the designated color is minimum, as a substitute color. As a result, thesubstitute color determiner 92 determines a colorimetric value RC32 that is present on the boundary Bc and spaced from the colorimetric value DC3 by a minimum distance, as a substitute color. - In step S6, the working
terminal 18 displays an evaluation result (particularly, a search result) acquired in step S5 on thedisplay device 34. Specifically, thedisplay screen generator 66 generates display data for asearch result screen 160, and then supplies the generated display data through the display I/F 56 to thedisplay device 34, which displays a new window W3 including thesearch result screen 160. - The
search result screen 160 shown inFIG. 10 includes asearch display field 162 for showing a search result about the designated color and abutton 164 labeled “CLOSE”. Thesearch display field 162 includes aresult list 142 havingsubfields FIG. 7A or the like. Thesearch display field 162 also includes a colorimetricvalue display field 166 for showing colorimetric values of designated colors and substitute colors, a colordifference display field 168 for showing a color difference, and acolor patch group 170. - The colorimetric
value display field 166 includes asubfield 172 showing types of colorimetric values on a left side, asubfield 173 showing colorimetric values DC3 (FIG. 6 ) of designated colors in the middle, and asubfield 174 showing colorimetric values RC31 (FIG. 9A ) of substitute colors on a right side. - The color
difference display field 168 shows the color difference Le between a colorimetric value DC3 and a colorimetric value RC31. Thecolor patch group 170 includes acolor patch 170 d of a designated color, i.e., a color representing a colorimetric value DC3, and acolor patch 170 r of a substitute color, i.e., a color representing a colorimetric value RC31, thecolor patches difference display field 168 allows the operator to grasp the relationship between a designated color and a substitute color at a glance. - In a case where the operator clicks on another
tab 176 of thesearch display field 162, thesearch result screen 160 shown inFIG. 10 switches to asearch result screen 160 shown inFIG. 11 , changing details of thesearch display field 162. A comparison betweenFIGS. 10 and 11 indicates that details displayed in thesubfields color patch 170 r is also slightly changed in a case where thesearch result screen 160 shown inFIG. 10 switches to thesearch result screen 160 shown inFIG. 11 . - Since a plurality of substitute colors (colorimetric values RC31, RC32) obtained according to difference color searching processes are presented at a time, the operator is given a wider choice of alternatives and may find it more convenient. Various known algorithms are available for the color searching processes. For example, the target (evaluation index) of a minimization algorithm may be not only color difference, but also lightness and saturation.
- The color
reproduction assisting system 40 includes theprinting condition acquirer 86 that acquires a plurality ofprinting conditions 60, the designatedcolor information acquirer 88 that acquires designatedcolor information 62 with respect to a single designated color, thereproducibility judging section 90 that judges whether the designated color specified from the designatedcolor information 62 can be reproduced under theprinting conditions 60, thesubstitute color determiner 92 that determines a substitute color that is different from the designated color in order to increase the number ofprinting conditions 60 under which the designated color can be reproduced on condition that at least one of theprinting conditions 60 under which the designated color cannot be reproduced is judged as being present, and thedisplay device 34 that displays visible information (the colorimetricvalue display field 166, the colordifference display field 168, and the color patch group 170) with respect to the substitute color. The colorreproduction assisting system 40 thus configured is capable of presenting particularly useful information in reproducing the single designated color under the printing conditions 60. - Configurational and operational details of a color reproduction assisting system 200 (see
FIG. 12 ) according to a modification of the above embodiment will be described below. - As shown in
FIG. 12 , the colorreproduction assisting system 200 has a workingterminal 202 and adisplay device 34. The workingterminal 202 includes aterminal controller 204 instead of the terminal controller 50 (FIG. 2 ), and is otherwise identical to the workingterminal 18. Theterminal controller 204 reads out and executes programs stored in theterminal memory 58 thereby to carry out functions including thedisplay screen generator 66, thedata acquirer 82, and the colorreproduction characteristics evaluator 84. - In the color
reproduction assisting system 200, the workingterminal 202 operates to evaluate the reproducibility of a designated color. The colorreproduction assisting system 200 thus configured offers the same advantages as those of the colorreproduction assisting system 40 according to the above embodiment. In steps S2, S3 shown inFIG. 4 , the workingterminal 202 needs to send a transmission request to theserver 16 for acquiring a plurality ofcolor profiles 78 andcolorimetric data 80. As the workingterminal 202 itself evaluates the reproducibility of a designated color, the transmitting and receiving process about the evaluation result in step S5 shown inFIG. 4 is not necessary. - Although the preferred embodiments of the present invention have been described in detail above, the present invention is not limited to the embodiments, but various many changes and modifications may be made to the embodiments without departing from the scope of the appended claims.
Claims (6)
Applications Claiming Priority (2)
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JP2013184868A JP2015053579A (en) | 2013-09-06 | 2013-09-06 | Color reproduction supporting system, method, and program |
JP2013-184868 | 2013-09-06 |
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US20150070717A1 true US20150070717A1 (en) | 2015-03-12 |
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US14/473,035 Active US9251446B2 (en) | 2013-09-06 | 2014-08-29 | Color reproduction assisting system, color reproduction assisting method, and non-transitory storage medium |
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US (1) | US9251446B2 (en) |
EP (1) | EP2846529A1 (en) |
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Cited By (1)
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US10496349B2 (en) | 2017-08-23 | 2019-12-03 | Seiko Epson Corporation | Profile adjustment system, profile adjustment device, and profile adjustment method |
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JP2015053579A (en) | 2015-03-19 |
US9251446B2 (en) | 2016-02-02 |
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